Oxfordshire

House extensions in Oxford

Looking to extend your home in Oxford? Start here: extension types, guide prices for Oxford, the planning rules that apply and how a project runs.

Postcode districtsOX1, OX2, OX3, OX4, OX5, OX33
Price regionSouth East England (×1.12)
Planning rulesEngland
Site visitFree, no obligation

Get my guide price Call 0800 088 6341

Side return extension on a Victorian terrace with a sloping glass roof over the kitchen

Popular extension prices in Oxford

Every figure below is a guide for Oxford, adjusted for South East England build costs (×1.12) and including VAT. Design and council fees are shown separately on each page.

Extension type	Example size	Standard spec (inc VAT)
Wraparound extensions	25 m²	£64,000 – £81,500
Side return extensions	11 m²	£29,500 – £37,000
Single-storey rear extensions	20 m²	£45,500 – £58,500
Kitchen extensions	20 m²	£47,000 – £59,500
Extensions over a garage	12 m²	£28,000 – £36,500
Orangery extensions	16 m²	£50,000 – £63,000
Conservatory replacement extensions	14 m²	£33,500 – £43,500

What works best for Oxford houses?

In the South East, plenty of houses have already been extended once, which makes checking the remaining permitted development allowance an important early step.

The types we would usually look at first for a home in Oxford are double-storey extensions, wraparound extensions and single-storey rear extensions, depending on the garden and how the house is laid out.

Covering Oxford and nearby

Across OX1, OX2, OX3, OX4, OX5, OX33, we can visit, measure and advise. The same team covers Abingdon (6 miles), Didcot (10 miles), Witney (10 miles), Bicester (11 miles), Thame (12 miles), all within easy reach. Aylesbury, in Buckinghamshire, is roughly 19 miles from Oxford and also on our list.

Planning rules in Oxford

In England a single-storey rear extension can usually go up to 3 m beyond the original rear wall of a semi-detached or terraced house, or 4 m on a detached house, without a planning application, provided it is no more than 4 m high, keeps eaves to 3 m within 2 m of a boundary and, with other buildings, covers no more than half the land around the original house. The larger home extension prior approval scheme raises those depths to 6 m and 8 m, with neighbours notified and a 42-day decision.

In England a single-storey side extension can be permitted development if it is no more than 4 m high and no wider than half the width of the original house. Two-storey side extensions, and any side extension on designated land such as a conservation area, need a householder planning application.

In a conservation area, national park, National Landscape, the Broads or a World Heritage Site the permitted development limits are tighter (no side or two-storey extensions without an application). Listed homes need listed building consent, and if permitted development rights have been removed, any extension needs an application.

Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.

Applications are decided by the local planning authority (your district, borough or unitary council).

All extension types we build in Oxford

Free site visit
We visit your Oxford home, measure up, talk through what you want and check the planning position.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
The build is managed from start to finish, inspected at each stage and signed off on completion.

Questions about extensions in Oxford

How much does an extension cost in Oxford?

Using our South East England factor (×1.12), a standard-spec single-storey extension of 20 m² is a guide £45,500 to £58,500 including VAT, and a 32 m² two-storey extension £64,500 to £84,500. Your written price follows the survey.

Do you handle building regulations?

Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.

Do I need planning permission for an extension in Oxford?

Not always. It depends on the size, position and your property's history. Many single-storey rear extensions in England are permitted development or can use prior approval.

Who do I contract with?

Your contract is with S&K Property Investments and Improvement Ltd, which designs and manages the project and the build teams who carry it out.

Can I get a price before anyone visits?

Yes. This page shows guide prices adjusted for Oxford, and the guide-price tool gives a range for your own size and finish in about a minute.

Book a free site visit in Oxford

We will measure up, check the planning position and give you honest guide figures.

Free, no-obligation site visit
Planning route checked before you spend on drawings
Written price once the design is agreed
Building control sign-off at the end

Prefer to talk? Call 0800 088 6341 or .

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